# Central versus Peripheral Vertigo

> Central vs peripheral vertigo in MBBS ENT: nystagmus characteristics, HINTS examination, red flags and a stepwise bedside approach.

- Canonical URL: https://prepelephant.com/topics/mbbs/ent/vertigo-central-vs-peripheral
- Exam / course: MBBS · Subject: ENT
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Central versus Peripheral Vertigo", PrepElephant, https://prepelephant.com/topics/mbbs/ent/vertigo-central-vs-peripheral

## Direct answer

Separating peripheral (labyrinth and vestibular nerve) from central (brainstem and cerebellum) vertigo is a bedside skill, and the discriminating features live in the nystagmus and its accompaniments. Peripheral vertigo is typically severe, positional, accompanied by nausea and hearing symptoms, with fatigable horizontal-torsional nystagmus that obeys Alexander's law. Central vertigo is often milder but persistent, with nystagmus that is purely vertical, purely torsional, direction-changing on lateral gaze, or non-fatigable, joined by diplopia, dysarthria, dysmetria, weakness or an abnormal head impulse test. Missing a central cause — posterior circulation stroke or a cerebellar tumour — is the disaster this differentiation exists to prevent.

## What you must remember

- **Peripheral roster:** benign paroxysmal positional vertigo (brief positional episodes, positive Dix-Hallpike), Meniere's disease (episodic vertigo with fluctuating low-frequency sensorineural loss, tinnitus and aural fullness), vestibular neuritis (acute sustained vertigo with normal hearing), labyrinthitis (vertigo with hearing loss) — mostly a clinical, not imaging, diagnosis.
- **Nystagmus signature:** peripheral nystagmus is horizontal with a torsional component, latency and fatigability on positional testing, and obeys Alexander's law; central nystagmus may be pure downbeat or upbeat, purely torsional, or direction-changing — and vertical nystagmus is always central.
- **HINTS battery:** in acute vestibular syndrome, a Normal head impulse test, direction-changing nystagmus on alternating gaze, or a positive Test of Skew suggests a central lesion — HINTS outperforms early MRI for posterior circulation stroke when applied by experienced hands.
- **Hearing loss and tinnitus** push the diagnosis toward the inner ear; hiccups, diplopia, dysarthria, dysphagia, ataxia out of proportion to vertigo, or vertical diplopia on skew testing push it centrally.
- **Timing patterns:** seconds-long positional spells suggest BPPV; minutes to hours suggest Meniere's or migraine; days of constant vertigo suggest neuritis or a central lesion; continuous and progressive vertigo is never benign.
- **Cannot stand without support** — severe imbalance suggesting a cerebellar or brainstem lesion rather than a peripheral one.
- **Imaging rule:** normal otoscopy plus central signs, risk factors for stroke, or new headache and neck pain mandate magnetic resonance imaging with diffusion-weighted sequences; computed tomography misses small posterior-fossa infarcts and is not a reassurance.

## Working through an acute vestibular syndrome

A 62-year-old hypertensive man arrives with 24 hours of continuous spinning, vomiting and unsteadiness. First, the head impulse: a corrective catch-up saccade toward the affected side indicates a deafferented labyrinth — vestibular neuritis; a normal test in a patient this unwell points brainstem-ward. Next, look at nystagmus in centre, right and left gaze: horizontal nystagmus beating away from a fixed side fits peripheral; nystagmus that reverses direction with gaze fits central. Then the cover-uncover test for skew deviation, a vertical correction signalling central involvement.

Suppose the head impulse is abnormal, nystagmus is unidirectional and hearing is normal: treat as vestibular neuritis with a short course of vestibular suppressants and early rehabilitation, because prolonged suppression delays compensation. Now change one detail — hearing loss with the vertigo. Labyrinthitis enters, but so does anterior inferior cerebellar artery infarction, and a diabetic or hypertensive patient with sudden dead ear plus vertigo deserves imaging the same day. Change another detail — direction-changing nystagmus with inability to sit unsupported — and the patient goes for urgent MRI whatever the head impulse shows.

## Where students slip

The classic error is labelling every acute vertigo "vertigo, tab Betahistine" without characterising the nystagmus or timing — examiners deliberately present an upbeat nystagmus to see whether the candidate recognises it as central. The second slip is over-ordering Dix-Hallpike in an acutely vomiting patient with continuous vertigo: Dix-Hallpike diagnoses BPPV, a seconds-long positional syndrome, not a continuous one. Third, candidates forget that a normal head impulse test in acute vestibular syndrome points centrally — the counter-intuitive direction of the HINTS logic. The expected exam sequence: characterise nystagmus, perform HINTS, test hearing, then choose between reassurance, Epley manoeuvre, suppressants or imaging.

## Frequently asked questions

### Which nystagmus features indicate a central cause?

Purely vertical or purely torsional nystagmus, direction-changing nystagmus on lateral gaze, absence of latency and fatigability on positional testing, and nystagmus disobeying Alexander's law all indicate central pathology.

### What does the HINTS examination stand for?

Head Impulse test, Nystagmus direction on gaze, and Test of Skew; a normal head impulse, direction-changing nystagmus or skew in acute vestibular syndrome points to a central lesion.

### How does timing help classify vertigo?

Seconds of positional spinning suggests BPPV, minutes to hours Meniere's disease or vestibular migraine, days of continuous vertigo neuritis or a central lesion, and progressive vertigo warrants imaging.

### When does vertigo require urgent magnetic resonance imaging?

Central nystagmus signs, abnormal HINTS findings, new headache or neck pain, vascular risk factors with sudden hearing loss and vertigo, or imbalance disproportionate to the vertigo all warrant diffusion-weighted MRI.

### Why does a normal head impulse test suggest central disease in acute vertigo?

A peripheral acute lesion deafferents the canal, so the VOR is lost and the head impulse is abnormal; an intact VOR with severe persistent vertigo means the brainstem is compensating abnormally — a central lesion.